The 8CM chassis are an extremly complex matter to sort out.
This small list is just an attempt to create a base for further discussions.
3001-3004 were of type 8C and there was no car with number 3017.

CHASSIS

COMMENTS

30053006

3005 and 3006 were narrow chassis cars raced by Sommer and Zehender in 1933.

3005 went back to the factory and was used by Taruffi.
It was used by Sommer at Spa 1934 and then used in minor hillclimb events. It ended up in South Africa 1936 (Bill Roderick).

3006 was used by Zehender in 1933 first as a private entry , then as a works car.
Sold to Raymond Sommer who with the help of SEFAC mechanics changed the car into a two-seater. Raced by Sommer in 1934.
Sold to Chambost for 1935 season. Fatal crash Deauville 1936.

30073018

3007 and 3018 were owned by Nuvolari.

3007:
Narrow chassis car. 2 April 1933 works car (raced by Nuvolari, Zehender)
25 July 1933 according to a contract Tazio Nuvolari changed the 3005 for this car. Raced by Nuvolari in 1933.
22 April 1934 crashed by Nuvolari at Alessandria. Probably rebuilt as 3016 and sold to Whitney Straight.

3018: Raced by Nuvolari in 1934. New engine installed in September and the car became the first 6C/1934.

30083022

3008:
16 October 1933 to Hans Rüesch (raced by Rüesch 1934-35)
22 August 1937 to Ecurie Genevoise (raced by Mandirola)
21 August 1938 to Auto-Agence S.A. (raced by Mandirola)

30093015

3009 and 3015 were bought by Nelly Braillard for her brother Louis and Robert Brunet.
Cars raced by Brunet, Sommer and Falchetto in 1934. Cars were first white/red (like 3008/3022 above) and later repainted blue. One of the cars was rebuilt with a higher tail.

3009 went to Luigi Soffietti in 1935.

One of the cars sold to Graf Festetics in 1937.

3010

3010 was a narrow chassis car owned by Philippe Etancelin.

Raced by Etancelin in 1934.
1935 sold to Armand Girod.

301130123016

Three cars were bought by Whitney Straight and pained white/blue. Two of the cars were rebuilt with heart shaped radiator.

3023

3023 was sold to Gino Rovere in December 1934 and raced by Farina in 1935.

30253026

3025 was delivered to Scuderia Subalpina in March 1935. 3026 was listed as works car and then delivered to Scuderia Subalpina in April 1935.

The cars were raced by Etancelin and Zehender during the 1935 season.

Note: The color of the Scuderia Subalpina logo is pure speculation.

3028

Reported to have been delivered to Jose de Villapadierna on 1 September 1935.
However, it looks like Villapadierna had the car as early as June 1935 and that it in fact was transferred to Scuderia Subalpina on 1 September.

Raced by Villapadierna and Lehoux.

3029

Sold to Nicola Borrelli in September 1935. Probably sold on to Lazlo Hartmann.

Three 8CTF cars were built. Chassis 3030 and 3031 were used by the works team for the 1938 season.
In 1939 the cars were only entered for the German GP. After that they were sold to
Lucy O'Reilly Schell, who entered them for the Swiss GP and then went with them to USA in 1940.
There the cars were enterd in Indy 500 until the 50s under a multitude of owners.
Chassis 3032 was sold to Wilbur Shaw who dominated the Indy 500 1939 and 1940 with the car and
led the 1941 race until having to retire.